Comment 3 for bug 1350257

The reason for this bug is explained here:
https://www.kubuntuforums.net/showthread.php?66053-Utopic-Upgrade&p=355573#post355573

It would appear that during the upgrade libnepomukcleaner4 becomes an obsoleted package, but does not remove itself from the DPKG status list.

libnepomukcore4abi1 is a dependancy of this library and nepomuk-common which is upgraded at the same time, they both have different versions of libnepomukcore4abi1 so an error is produced.

A workaround is to do:
dpkg --purge libnepomukcleaner4